Recommended Offer by Alterian plc for Mediasurface plc

16th May 2008 – UK. The boards of Alterian and Mediasurface are today pleased to announce that they have reached agreement on the terms of a recommended offer by Alterian to acquire the entire issued and to be issued share capital of Mediasurface.

The Offer will be on the basis of 9 pence in cash and 0.0375 of a Consideration Share for each Mediasurface Share. The Offer values the entire issued and to be issued share capital of Mediasurface at approximately £18.1 million and each Mediasurface Share at 15 pence (based on the Closing Price of 160 pence per Alterian Share on 15

May 2008), representing a premium of 150.0 per cent to the Closing Price of 6 pence per Mediasurface Share on 23 April 2008 (being the last business day prior to the commencement of the Offer Period).

Alterian is a leading international provider of enterprise management software with its headquarters in Bristol, UK, but with a significant proportion of its operations in North America. The Company employs over 130 staff in the United Kingdom and North America. Since being admitted to the Official List in 2000, Alterian has grown both organically and through the completion of several acquisitions which have been successfully integrated into its business in order to extend the Company’s market reach and broaden its product offering.

Alterian's Integrated Marketing Platform helps marketers gain measurable improvement in the results of their activities. It provides marketers with practical and cost effective insight into their data and the tools to use this to execute an integrated marketing strategy across both online and offline channels. The Company has made a substantial investment in the Integrated Marketing Platform, both through organic development and acquisitions, to build on the core marketing analytics engine with marketing execution capabilities and applications to manage the marketing process. Alterian is highly rated by market researchers Gartner and Forrester as an enterprise marketing platform provider and by Jupiter as an email marketing platform provider.

Mediasurface provides Web Content Management software which enables the storage and delivery of content via web sites and other electronic channels. Whilst Web Content Management software can deliver personalised content, it is generally based on rules from other software and requires significant services investment. Investments in website content management are increasingly being driven by a desire to improve the customer experience.